Allow for the use of `@flow`s with Jobflow

[Andrew-S-Rosen]

What new feature would you like to see?

Hinges on two things:

• https://github.com/materialsproject/jobflow/pull/547
• https://github.com/materialsproject/jobflow/pull/450

[Andrew-S-Rosen]

We might be able to use Covalent as an intermediary to get the Jobflow Flow since they have a nice compiler for the Lattice objects.

import covalent as ct
import json

@ct.electron
def add(a, b):
    return a+b

@ct.lattice
def my_flow(a, b):
    return add(a, b)

my_flow.build_graph(1, 2)

json.loads(my_flow.transport_graph.serialize_to_json())